Superbroadband Near-Infrared Emission in Tm-Bi Codoped Sodium-Germanium-Gallate Glasses

Department of Electronic Engineering, City University of Hong Kong, Kowloon, Hong Kong, China.
Optics Express (Impact Factor: 3.49). 03/2011; 19(7):6514-23. DOI: 10.1364/OE.19.006514
Source: PubMed


Superbroadband emission from 1.0 to 1.7 μm wavelength was observed in thulium-bismuth (Tm-Bi) codoped sodium-germanium-gallate (NGG) glasses under 793 nm excitation. Efficient energy transfer process from Bi to Tm ions, with value as high as 67.7%, was achieved which is beneficial in achieving flat broadband lineshape. The large stimulated emission cross-section and measured lifetime confirm the potentials of Tm-Bi codopants as luminescence sources for superbroadband near-infrared (NIR) optical amplifiers and tunable lasers. Planar optical waveguides were fabricated successfully in the codoped NGG glasses using K(+)-Na(+) ion-exchange process.

1 Follower
9 Reads
  • Source
    • "Investigations were carried out mainly on the glasses co-doped by Bi+Yb [12] [13] [14] [15], Bi+Er [16] [17] [18], and Bi+Tm [19] [20]. But we consider the research in this area to be beyond the scope of this review. "
    [Show abstract] [Hide abstract]
    ABSTRACT: The current state of the art in infrared Bi-doped fiber laser research is reviewed. The relevant fiber glass compositions and fiber technologies are introduced. Lasers operating on transitions ranging from 1.15 to 1.55 μm occurring in the bismuth active centers and their energy level schemes are discussed on the basis of the spectroscopic properties of these centers. Continuous-wave fundamental-mode power levels ranging from a few mW near 1.55 μm up to 16 W near 1.16 μm and 22 W near 1.46 μm have been demonstrated in recent years.
    IEEE Journal of Selected Topics in Quantum Electronics 09/2014; 20(5):1-15. DOI:10.1109/JSTQE.2014.2312926 · 2.83 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: A bismuth-doped fibre laser emitting at wavelengths within the second transparency window of silica fibres is fabricated. It is shown that Bi-doped aluminium-free phosphogermanosilicate fibres pumped in the regions of 800 and 1200 nm have the amplification band at 1275—1375 nm.
    Quantum Electronics 07/2008; 38(7):615-617. DOI:10.1070/QE2008v038n07ABEH013915 · 0.90 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The effects of temperature, pump power and excitation wavelength on near-infrared photoluminescence from Bi-doped multi-component germanate glasses are presented. Compared to conventional silica/silicate matrices, the examined material exhibits superior resistance to thermal quenching and less pronounced excited state absorption for pumping at 808 nm. It is shown that by selecting the optimal excitation wavelength, photoemission can be initiated from multiple active centers in parallel, resulting in an emission bandwidth (full width at half maximum) of more than 370 nm. Er3+/Bi co-doping is presented as an effective means to significantly enhance emission intensity around 1.5 μm by suppressing the typical Er3+-related red-to-green upconversion. Besides its relevance for Bi-doped materials, this also indicates a new route towards improving the performance of Er-based optical devices. The mechanism of Er3+→Bi energy transfer is examined in detail. Adjusting the molar ratio between both species provides an effective tool for tuning the emission scheme and further increasing emission bandwidth.
    Optics Express 10/2011; 19(21):20799-807. DOI:10.1364/OE.19.020799 · 3.49 Impact Factor
Show more


9 Reads
Available from